1. Total number of bacteria as a trophic state index;Aizaki;Verh. Int. Verein. Limnol.,1985
2. Standard Methods for the Examination of Water and Wastewater,1988
3. Limnological study of the Karelian east humus lakes - general characteristics of zooplankton;Andronikova,1986
4. Phyto- and zooplankton in relation to water pH and humic content in small lakes in Southern Finland Verh;Arvola;Int. Verein. Limnol.,1980
5. Rotifer occurrence in relations to pH;Berzins;Hydrobiologia,1987